The ElektroPhysik 80-137-4000 MiniTest 735 Coating Thickness Gauge N7 HD, Non-Ferrous Metals, 280 Mils / 7112 Microns (Heavy Duty) is the solution to all your coating thickness problems where a reliable finish and perfect product appearance play a major role for long-term value and success, e.g. in the automotive and shipbuilding industry, steel- and bridge construction or in the electroplating industry, to name a few industries.